Black Screen on iPhone when accessing VNC Server on my Mac (Ventura).

I'm intermittently getting a black screen on my iPhone when access the RealVNC Server on my Mac.  Typically I can correct it by going to my Mac and quitting RealVNC Server and restarting it but today that isn't working.  

I'll be traveling soon so this and restarting my Mac won't be options.

Is anyone experiencing this issue or maybe have a solution?

Thank you

   -- Howard